EP0364851B1 - Sealing arrangement for the reservoir tube of a device consisting of a reservoir tube and a piston rod - Google Patents

Sealing arrangement for the reservoir tube of a device consisting of a reservoir tube and a piston rod Download PDF

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Publication number
EP0364851B1
EP0364851B1 EP89118722A EP89118722A EP0364851B1 EP 0364851 B1 EP0364851 B1 EP 0364851B1 EP 89118722 A EP89118722 A EP 89118722A EP 89118722 A EP89118722 A EP 89118722A EP 0364851 B1 EP0364851 B1 EP 0364851B1
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EP
European Patent Office
Prior art keywords
piston rod
arrangement according
closure arrangement
protective cap
rod guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89118722A
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German (de)
French (fr)
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EP0364851A1 (en
Inventor
Herbert Freitag
Castor Fuhrmann
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Stabilus GmbH
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Stabilus GmbH
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Publication of EP0364851A1 publication Critical patent/EP0364851A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3235—Constructional features of cylinders
    • F16F9/3242—Constructional features of cylinders of cylinder ends, e.g. caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/362—Combination of sealing and guide arrangements for piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces

Definitions

  • the invention relates to a closure arrangement on the container tube of a container tube piston rod device, in particular a pneumatic spring, consisting of a container tube in which there is possibly a medium under pressure, and a piston rod which extends and retracts into the container tube and which is guided in a piston rod guide and optionally sealed to the outside with a piston rod seal, the piston rod guide being held in place with a flange of the container tube and the flange being covered by a protective cap.
  • a pneumatic spring consisting of a container tube in which there is possibly a medium under pressure
  • a piston rod which extends and retracts into the container tube and which is guided in a piston rod guide and optionally sealed to the outside with a piston rod seal
  • the piston rod guide being held in place with a flange of the container tube and the flange being covered by a protective cap.
  • a shock absorber in which the piston rod end of the cylinder is cranked radially inwards and by means of this cranking the piston rod guide is secured against axial displacement out of the cylinder.
  • a cap is placed on the piston rod-side end of the cylinder, which lies with its jacket on the outside of the cylinder and with its end wall on the cranked end of the Cylinder rests.
  • the cap is designed as a bearing for a stop plate which interacts with a buffer attached to the piston rod when the piston rod approaches its innermost position within the cylinder.
  • There is no question of corrosion protection of the part of the cylinder which is cranked for axially securing the piston rod guide There is no question of corrosion protection of the part of the cylinder which is cranked for axially securing the piston rod guide.
  • the cladding of the cap adhering to the outside of the cylinder can prove to be very unsuitable, in particular for gas springs in which there is a risk of an injuring or painful contact due to the
  • the invention has for its object to improve the closure technology of container tubes of the generic type, in particular with gas springs, with regard to corrosion protection, to avoid or round off metallic edges as far as possible and to improve the optical design of the pressure tube end.
  • the piston rod guide is provided at its outlet end with a radial undercut in which the protective cap is fixed and / or in that an annular extension of the protective cap through a mounting sleeve radially outward against an inner peripheral surface of a shoulder formed at the outlet end of the piston rod guide is pressed.
  • the piston rod guide 14 has a on the low-pressure side facing away from the compressed gas chamber 13 radially outward running axial undercut 16, which is provided with an undercut angle 17.
  • the undercut angle 17 is approximately 15 to 25 degrees.
  • the circumferential undercut 16 merges into a radially extending stop surface 19.
  • the axially outer diameter 18 of the undercut 16 is larger than the outer diameter of the piston rod 12 by a predetermined amount.
  • the protective cap 20 shown in Fig. 3 consists essentially of an axially extending cylindrical seat ring 25 and an integrally molded, axially outer, substantially radially extending cover cap 27.
  • the cylindrical seat ring 25 merges axially on the inside in one piece into a snap ring 26 which moves around an undercut angle 23 is angled radially outward.
  • the angled snap ring 26 has at its end opposite the cover cap 27 a radially extending seat surface 24 which can be brought into abutment in the installed position on the stop surface 19 of the piston rod guide 14.
  • the predetermined amount, by which the diameter 18 of the undercut 16 is larger than the outer diameter of the piston rod 12, corresponds approximately to twice the wall thickness of the seat ring 25.
  • the seat surface 24 merges into a mounting bevel 22.
  • the mounting bevel 22 has an angle of approximately 30 to 45 degrees.
  • a fastening collar 21 is provided, which is angled with an undercut angle 23 from the axially extending longitudinal direction.
  • the undercut angle 23 is also 15 to 25 degrees.
  • the fastening collar 21 represents the radially outermost extension of the angled snap ring 26. In the installed position, the fastening collar 21 corresponds to the undercut 16 of the piston rod guide 14.
  • the cover lip 28 is formed corresponding to the flange 15 of the container tube 11 and merges in one piece into a radially outer sealing lip 29. In the installed position, the sealing lip 29 fits tightly against the outer contour of the flange 15. This results in an optically improved closure of the container tube 11, which meets the installation standards for rounded components in passenger compartments in a rounded and edge-free manner.
  • a mounting sleeve 30 is integrally formed radially on the inside via a predetermined breaking point 31 on the cylindrical seat ring 25 of the protective cap 20.
  • the assembly sleeve 30 is in its pre-assembly position shown with a predetermined Overhang 34 axially over the cap 27.
  • an annular space 32 is free between the piston rod 12 and the snap ring 26, into which the mounting sleeve can be pressed in the piston rod guide 14 for actually fixing the protective cap 20.
  • the mounting sleeve 30 shears off at the predetermined breaking point 31 and presses the snap ring 26 radially outward.
  • this version can, for example, be pressed into a cylindrical shoulder with pretension.
  • the inside diameter 33 of the mounting sleeve 30 is somewhat larger than the outside diameter of the piston rod 12.
  • the piston rod 12 is thus freely axially movable in the mounting sleeve 30.
  • an additional sealing lip 35 is integrally formed on the seat ring 25 radially on the inside.
  • the additional sealing lip 35 is at a predetermined spreading angle 36 from the axial longitudinal direction and is directed against the high-pressure side. Its axially inward-pointing free end 37 is beveled, the bevel angle 38 being approximately 25 to 45 degrees.
  • Such a sealing lip 35 preferably wipes off escaping medium, for example damping and / or lubricating oil during the extension movement of the piston rod 12.
  • a lubrication pocket 39 is created by the spreading angle 36, so that the main seal (not shown) is positively supported with regard to its service life and its functional values.
  • the contamination is wiped off the piston rod 12 and kept away from the main seal arranged axially on the inside.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Description

Die Erfindung betrifft eine Abschlußanordnung am Behälterrohr eines Behälterrohr-Kolbenstangengeräts, insbesondere einer pneumatischen Feder, bestehend aus einem Behälterrohr, in dem sich ein gegebenenfalls unter Druck stehendes Medium befindet, und einer in das Behälterrohr ein- und ausfahrenden Kolbenstange, die in einer Kolbenstangenführung geführt und gegebenenfalls mit einer Kolbenstangendichtung nach außen hin abgedichtet ist, wobei die Kolbenstangenführung mit einer Umbördelung des Behälterrohres in ihrer Lage gehalten ist und die Umbördelung von einer Schutzkappe überdeckt ist.The invention relates to a closure arrangement on the container tube of a container tube piston rod device, in particular a pneumatic spring, consisting of a container tube in which there is possibly a medium under pressure, and a piston rod which extends and retracts into the container tube and which is guided in a piston rod guide and optionally sealed to the outside with a piston rod seal, the piston rod guide being held in place with a flange of the container tube and the flange being covered by a protective cap.

Bei den derzeit am Markt befindlichen Gasfedern, wie sie beispielsweise in dem DE-U-79 20 645 beschrieben ist, ist es üblich, die Druckrohre durch Umbördeln zu verschliessen. Dabei besteht jedoch das Problem, daß bei den heutigen Lackschutzmaßnahmen und Verfahren die Lackierung in dem Bereich zwischen der umgebördelten Planfläche bis zur Anlage der Kolbenstangenführung kein ausreichender Korrosionsschutz gewährleistet ist.In the gas springs currently on the market, as described, for example, in DE-U-79 20 645, it is customary to close the pressure pipes by flanging. However, there is the problem that with today's paint protection measures and processes, the coating in the area between the flanged flat surface until the piston rod guide does not provide adequate protection against corrosion.

Aus der GB-A-2 000 251 gemäß Oberbegriff des Anspruchs 1 ist ein Stoßdämpfer bekannt, bei welcher das kolbenstangenseitige Ende des Zylinders radial einwärts gekröpft ist und durch diese Kröpfung die Kolbenstangenführung gegen Axialverschiebung aus dem Zylinder heraus sichert. Dabei ist auf das kolbenstangenseitige Ende des Zylinders eine Kappe aufgesetzt, die mit ihrem Mantel an der Außenseite des Zylinders anliegt und mit ihrer Stirnwand auf dem gekröpften Ende des Zylinders aufliegt. Die Kappe ist dabei als Lager für eine Anschlagplatte ausgebildet, die mit einem an der Kolbenstange befestigten Puffer dann zusammenwirkt, wenn sich die Kolbenstange ihrer innersten Stellung innerhalb des Zylinders nähert. Von einem Korrosionsschutz des zur axialen Sicherung der Kolbenstangenführung gekröpften Teils des Zylinders ist hierbei nicht die Rede. Der an der Außenseite des Zylinders anhaftende Mantel der Kappe kann sich als sehr unzweckmäßig erweisen, insbesondere bei Gasfedern, bei denen wegen der Berührungsmöglichkeit mit einer Bedienungsperson die Gefahr einer verletzenden oder schmerzerzeugenden Berührung besteht.From GB-A-2 000 251 according to the preamble of claim 1 a shock absorber is known in which the piston rod end of the cylinder is cranked radially inwards and by means of this cranking the piston rod guide is secured against axial displacement out of the cylinder. Here, a cap is placed on the piston rod-side end of the cylinder, which lies with its jacket on the outside of the cylinder and with its end wall on the cranked end of the Cylinder rests. The cap is designed as a bearing for a stop plate which interacts with a buffer attached to the piston rod when the piston rod approaches its innermost position within the cylinder. There is no question of corrosion protection of the part of the cylinder which is cranked for axially securing the piston rod guide. The cladding of the cap adhering to the outside of the cylinder can prove to be very unsuitable, in particular for gas springs in which there is a risk of an injuring or painful contact due to the possibility of contact with an operator.

Der Erfindung liegt die Aufgabe zugrunde, die Verschlußtechnik von Behälterrohren gattungsgemäßer Art, insbesondere bei Gasfedern, hinsichtlich des Korrosionsschutzes zu verbessern, metallische Kanten nach Möglichkeit zu vermeiden oder abzurunden und die optische Formgestaltung des Druckrohrabschlusses zu verbessern.The invention has for its object to improve the closure technology of container tubes of the generic type, in particular with gas springs, with regard to corrosion protection, to avoid or round off metallic edges as far as possible and to improve the optical design of the pressure tube end.

Diese Aufgabe wird dadurch gelöst, daß die Kolbenstangenführung an ihrem austrittseitigen Ende mit einer radialen Hinterschneidung versehen ist, in der die Schutzkappe festgelegt ist und/oder daß ein Ringfortsatz der Schutzkappe durch eine Montagehülse radial auswärts gegen eine Innenumfangsfläche eines am austrittseitigen Ende der Kolbenstangenführung ausgebildeten Absatzes verpreßt ist.This object is achieved in that the piston rod guide is provided at its outlet end with a radial undercut in which the protective cap is fixed and / or in that an annular extension of the protective cap through a mounting sleeve radially outward against an inner peripheral surface of a shoulder formed at the outlet end of the piston rod guide is pressed.

Weitere vorteilhafte Maßnahmen sind in den Unteransprüchen beschrieben. Die Erfindung ist in der beiliegenden Zeichnung dargestellt und wird nachfolgend näher beschrieben; es zeigt:

Fig. 1
die schematische Darstellung der Abschlußanordnung einer Gasfeder mit Behälterrohr, Kolbenstangenführung und Kolbenstange und mit einer die Umbördelung überdeckenden Schutzkappe;
Fig. 2
die Detaildarstellung einer Kolbenstangenführung nach der Fig. 1, geschnitten;
Fig. 3
die Detaildarstellung einer Schutzkappe für die Umbördelung des Behälterrohres einer Gasfeder nach der Fig. 1, mit einem Befestigungsbund und pilzförmiger Abdecklippe;
Fig. 4
die Detaildarstellung einer Schutzkappe nach der Fig. 3 mit einem zusätzlichen, einstückig angeformten Montagering;
Fig. 5
die Detaildarstellung einer Schutzkappe nach der Fig. 3 mit zusätzlicher radialer Dichtlippe;
Die in der Fig. 1 dargestellte Gasfeder 10 besteht im wesentlichen aus einem Behälterrohr 11 mit einem Druckgasraum 13 und einer in das Behälterrohr 11 ein- und ausfahrbaren Kolbenstange 12. Die Kolbenstange 12 ist in einer Kolbenstangenführung 14 geführt. Die Kolbenstangenführung 14 ist auf der dem Druckgasraum 13 abgewandten Niederdruckseite mit einer Umbördelung 15 des Behälterrohres 11 in ihrer Lage gehalten. Über die Umbördelung 15 ist eine Schutzkappe 20 gestülpt.Further advantageous measures are described in the subclaims. The invention is illustrated in the accompanying drawing and is described in more detail below; it shows:
Fig. 1
the schematic representation of the end arrangement of a gas spring with a container tube, piston rod guide and piston rod and with a protective cap covering the flanging;
Fig. 2
the detailed view of a piston rod guide according to FIG. 1, cut;
Fig. 3
the detailed view of a protective cap for the flanging of the container tube of a gas spring according to Figure 1, with a fastening collar and mushroom-shaped cover lip.
Fig. 4
the detailed representation of a protective cap according to Figure 3 with an additional, integrally molded mounting ring.
Fig. 5
the detailed representation of a protective cap according to Figure 3 with an additional radial sealing lip.
The gas spring 10 shown in FIG. 1 essentially consists of a container tube 11 with a compressed gas space 13 and a piston rod 12 that can be extended and retracted into the container tube 11. The piston rod 12 is guided in a piston rod guide 14. The piston rod guide 14 is held in position on the low-pressure side facing away from the compressed gas chamber 13 with a flange 15 of the container tube 11. A protective cap 20 is placed over the flange 15.

Wie die Fig. 2 zeigt, weist die Kolbenstangenführung 14 auf der dem Druckgasraum 13 abgewandten Niederdruckseite eine radial nach außen laufende axiale Hinterschneidung 16 auf, die mit einem Hinterschneidungswinkel 17 versehen ist. Der Hinterschneidungswinkel 17 beträgt etwa 15 bis 25 Grad. Axial innen geht die rundumlaufende Hinterschneidung 16 in eine radial verlaufende Anschlagfläche 19 über. Der axial äußere Durchmesser 18 der Hinterschneidung 16 ist um einen vorbestimmten Betrag größer als der Außendurchmesser der Kolbenstange 12.As shown in FIG. 2, the piston rod guide 14 has a on the low-pressure side facing away from the compressed gas chamber 13 radially outward running axial undercut 16, which is provided with an undercut angle 17. The undercut angle 17 is approximately 15 to 25 degrees. Axially on the inside, the circumferential undercut 16 merges into a radially extending stop surface 19. The axially outer diameter 18 of the undercut 16 is larger than the outer diameter of the piston rod 12 by a predetermined amount.

Die in der Fig. 3 dargestellte Schutzkappe 20 besteht im wesentlichen aus einem axial verlaufenden zylindrischen Sitzring 25 und einer einstückig angeformten, axial außen, im wesentlichen radial verlaufenden Abdeckkappe 27. Der zylindrische Sitzring 25 geht axial innen einstückig in einen Schnappring 26 über, der um einen Hinterschneidungswinkel 23 nach radial außen abgewinkelt ist. Der abgewinkelte Schnappring 26 weist an seinem, der Abdeckkappe 27 entgegengesetzten Ende eine radial verlaufende Sitzfläche 24 auf, die in Einbaulage an der Anschlagfläche 19 der Kolbenstangenführung 14 zur Anlage bringbar ist. Der vorbestimmte Betrag, um den Durchmesser 18 der Hinterschneidung 16 gößer als der Außendurchmesser der Kolbenstange 12 ist, entspricht dabei etwa der doppelten Wandstärke des Sitzringes 25.The protective cap 20 shown in Fig. 3 consists essentially of an axially extending cylindrical seat ring 25 and an integrally molded, axially outer, substantially radially extending cover cap 27. The cylindrical seat ring 25 merges axially on the inside in one piece into a snap ring 26 which moves around an undercut angle 23 is angled radially outward. The angled snap ring 26 has at its end opposite the cover cap 27 a radially extending seat surface 24 which can be brought into abutment in the installed position on the stop surface 19 of the piston rod guide 14. The predetermined amount, by which the diameter 18 of the undercut 16 is larger than the outer diameter of the piston rod 12, corresponds approximately to twice the wall thickness of the seat ring 25.

Radial außen geht die Sitzfläche 24 in eine Montageschräge 22 über. Die Montageschräge 22 weist einen Winkel von etwa 30 bis 45 Grad auf. Am radial äußeren Umfang des abgewinkelten Schnapprings 26 ist ein Befestigungsbund 21 vorgesehen, der mit einem Hinterschneidungswinkel 23 aus der axial verlaufenden Längsrichtung abgewinkelt ist. Der Hinterschneidungswinkel 23 beträgt ebenfalls 15 bis 25 Grad. Der Befestigungsbund 21 stellt die radial äußerste Erstreckung des abgewinkelten Schnappringes 26 dar. In Einbaulage korrespondiert der Befestigungsbund 21 mit der Hinterschneidung 16 der Kolbenstangenführung 14.Radially outside, the seat surface 24 merges into a mounting bevel 22. The mounting bevel 22 has an angle of approximately 30 to 45 degrees. On the radially outer circumference of the angled snap ring 26, a fastening collar 21 is provided, which is angled with an undercut angle 23 from the axially extending longitudinal direction. The undercut angle 23 is also 15 to 25 degrees. The fastening collar 21 represents the radially outermost extension of the angled snap ring 26. In the installed position, the fastening collar 21 corresponds to the undercut 16 of the piston rod guide 14.

Die an den zylindrischen Sitzring 25 der Schutzkappe 20 einstückig angeformte Abdeckkappe 27 geht radial außen in eine pilzförmig ausgebildete Abdecklippe 28 über. Die Abdecklippe 28 ist mit der Umbördelung 15 des Behälterrohres 11 korrespondierend ausgebildet und geht einstückig in eine radial äußere Dichtlippe 29 über. In Einbaulage schmiegt sich die Dichtlippe 29 dichtend an die Außenkontur der Umbördelung 15 an. Dadurch entsteht ein optisch verbesserter Abschluß des Behälterrohres 11, der abgerundet und kantenfrei die Einbaunormen für abgerundete Bauteile in Fahrgasträumen erfüllt.The cover cap 27 integrally molded onto the cylindrical seat ring 25 of the protective cap 20 merges radially on the outside into a mushroom-shaped cover lip 28. The cover lip 28 is formed corresponding to the flange 15 of the container tube 11 and merges in one piece into a radially outer sealing lip 29. In the installed position, the sealing lip 29 fits tightly against the outer contour of the flange 15. This results in an optically improved closure of the container tube 11, which meets the installation standards for rounded components in passenger compartments in a rounded and edge-free manner.

Bei der in der Fig. 4 dargestellten Ausführungsform ist an den zylindrischen Sitzring 25 der Schutzkappe 20 eine Montagehülse 30 radial innen über eine Sollbruchstelle 31 einstückig angeformt. Die Montagehülse 30 steht in ihrer dargestellten Vor-Montagepositon mit einem vorbestimmten Überstand 34 axial über die Abdeckkappe 27 über. In Montageposition liegt zwischen der Kolbenstange 12 und dem Schnappring 26 ein Ringraum 32 frei, in den die Montagehülse zum eigentlichen Festsetzen der Schutzkappe 20 in der Kolbenstangenführung 14 eingepreßt werden kann. Dabei schert die Montagehülse 30 an der Sollbruchstelle 31 ab und verpreßt den Schnappring 26 radial nach außen. Diese Version kann beispielsweise bei Bauteilen ohne eine Hinterschneidung im Bereich der Kolbenstangenführung 14 in einen zylindrischen Absatz mit Vorspannung eingepreßt werden. Der Innendurchmesser 33 der Montagehülse 30 ist dabei etwas größer als der Außendurchmesser der Kolbenstange 12. Die Kolbenstange 12 ist so frei in der Montagehülse 30 axial beweglich.In the embodiment shown in FIG. 4, a mounting sleeve 30 is integrally formed radially on the inside via a predetermined breaking point 31 on the cylindrical seat ring 25 of the protective cap 20. The assembly sleeve 30 is in its pre-assembly position shown with a predetermined Overhang 34 axially over the cap 27. In the mounting position, an annular space 32 is free between the piston rod 12 and the snap ring 26, into which the mounting sleeve can be pressed in the piston rod guide 14 for actually fixing the protective cap 20. The mounting sleeve 30 shears off at the predetermined breaking point 31 and presses the snap ring 26 radially outward. In the case of components without an undercut in the region of the piston rod guide 14, this version can, for example, be pressed into a cylindrical shoulder with pretension. The inside diameter 33 of the mounting sleeve 30 is somewhat larger than the outside diameter of the piston rod 12. The piston rod 12 is thus freely axially movable in the mounting sleeve 30.

Bei der in der Fig. 5 dargestellten Ausführungsform der Schutzkappe 20 ist an dem Sitzring 25 radial innen eine zusätzliche Dichtlippe 35 einstückig angeformt. Die zusätzliche Dichtlippe 35 steht in einem vorbestimmten Abspreizwinkel 36 aus der axialen Längsrichtung und ist gegen die Hochdruckseite gerichtet. Ihr axial nach innen weisendes freies Ende 37 ist angeschrägt, wobei der Anschrägwinkel 38 ca. 25 bis 45 Grad beträgt. Eine derartige Dichtlippe 35 streift bevorzugt austretendes Medium, beispielsweise Dämpf-und/oder Schmieröl bei der Ausschubbewegung der Kolbenstange 12 ab.In the embodiment of the protective cap 20 shown in FIG. 5, an additional sealing lip 35 is integrally formed on the seat ring 25 radially on the inside. The additional sealing lip 35 is at a predetermined spreading angle 36 from the axial longitudinal direction and is directed against the high-pressure side. Its axially inward-pointing free end 37 is beveled, the bevel angle 38 being approximately 25 to 45 degrees. Such a sealing lip 35 preferably wipes off escaping medium, for example damping and / or lubricating oil during the extension movement of the piston rod 12.

Zwischen der Dichtlippe 35 und dem Schnappring 26 entsteht durch den Abspreizwinkel 36 eine Schmiertasche 39, so daß die - nicht dargestellte - Hauptdichtung hinsichtlich ihrer Lebensdauer und ihrer Funktionswerte positiv unterstützt wird. Neben dem Abstreifen von Öl bei der Ausschubbewegung wird die Verschmutzung von der Kolbenstange 12 abgestreift und von der axial innen nachgeordneten Hauptdichtung ferngehalten.Between the sealing lip 35 and the snap ring 26, a lubrication pocket 39 is created by the spreading angle 36, so that the main seal (not shown) is positively supported with regard to its service life and its functional values. In addition to wiping off oil during the ejection movement, the contamination is wiped off the piston rod 12 and kept away from the main seal arranged axially on the inside.

Claims (13)

  1. A closure arrangement on the container tube (11) of a container tube-piston rod appliance, particularly of a pneumatic spring, consisting of a container tube (11) in which there is a possibly pressurised medium, and adapted to be retracted into and extended out of the container tube (11), a piston rod (12) which is guided in a piston rod guide (14) and which is possibly sealed outwardly by a piston rod gasket (35), the piston rod guide (14) being supported in its position by a flanging-over (15) of the container tube (11), the flanging-over (15) being covered by a protective cap (20), characterised in that the piston rod guide (14) is provided at its outlet end with a radial back-taper (16) in which the protective cap (20) is fixed and/or in that an annular projection (26) of the protective cap (20) is pressed radially outwardly by a mounting sleeve (30) against an inner peripheral face (16) of a shoulder constructed at the outlet end of the piston rod guide (14).
  2. A closure arrangement according to Claim 1, characterised in that the protective cap (20) is provided with an axially extending cylindrical seating ring (25) and a radially outwardly extending cover cap (27), the seating ring (25) merging axially inwardly in one piece into an angled-over snap-action ring (26) which is provided radially outwardly with an encircling fixing shoulder (21) which can be brought into operative connection with the back-taper (16) in the piston rod guide (14).
  3. A closure arrangement according to Claim 2, characterised in that the snap-action ring (26) is provided axially inwardly with an oblique mounting surface (22) converging on the fixing shoulder (21).
  4. A closure arrangement according to Claim 2 or 3, characterised in that the fixing shoulder (21) is provided with a back-taper angle (23) which corresponds approximately to the back-taper angle (17) of the back-taper (16) on the piston rod guide (14).
  5. A closure arrangement according to Claims 2 to 4, characterised in that the snap-action ring (26) has a radially extending seating surface (24) which, in the installed position, bears on an abutment surface (19) on the piston rod guide (14).
  6. A closure arrangement according to one of Claims 1 to 5, characterised in that in the installed position, the protective cap (20) has a mushroom-like covering lip (26) which in sealing-tight manner covers the flanging-over (15).
  7. A closure arrangement according to one of Claims 1 to 6, characterised in that the protective cap (20) is provided radially inwardly with a sealing lip (35) adapted to cooperate with the piston rod (12).
  8. A closure arrangement according to Claim 7, characterised in that the sealing lip (35) extends towards the interior (13) of the container tube with an opened out angle (36).
  9. A closure arrangement according to one of Claims 1 to 8, characterised in that the mounting sleeve (30) is disposed radially within the protective cap (20).
  10. A closure arrangement according to Claim 9, characterised in that the mounting sleeve (30) is connected in one piece to the protective cap via an easily separated location (31).
  11. A closure arrangement according to one of Claims 1 to 9, characterised in that the mounting sleeve (30) consists of a harder material than the protective cap (20).
  12. A closure arrangement according to one of Claims 1 to 11, characterised in that the inside diameter (33) of the mounting sleeve (30) is sufficiently greater than the outside diameter of the piston rod (12) that the piston rod (12) is able to slide freely in the mounting sleeve (30).
  13. A closure arrangement according to one of Claims 1 to 12, characterised in that in the pre-assembly position, the mounting sleeve (30) projects in a radial direction beyond the protective cap (20) by a predeterminable amount (34).
EP89118722A 1988-10-10 1989-10-09 Sealing arrangement for the reservoir tube of a device consisting of a reservoir tube and a piston rod Expired - Lifetime EP0364851B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3834432A DE3834432A1 (en) 1988-10-10 1988-10-10 PROTECTIVE CAP WITH SEALING FUNCTION FOR PRESSURE PIPE BORING
DE3834432 1988-10-10

Publications (2)

Publication Number Publication Date
EP0364851A1 EP0364851A1 (en) 1990-04-25
EP0364851B1 true EP0364851B1 (en) 1993-08-18

Family

ID=6364768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118722A Expired - Lifetime EP0364851B1 (en) 1988-10-10 1989-10-09 Sealing arrangement for the reservoir tube of a device consisting of a reservoir tube and a piston rod

Country Status (3)

Country Link
EP (1) EP0364851B1 (en)
DE (2) DE3834432A1 (en)
ES (1) ES2045331T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1672243A1 (en) 2004-12-15 2006-06-21 Stabilus GmbH Piston-cylinder unit and method for its manufacture

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE512548C2 (en) * 1998-07-24 2000-04-03 Volvo Ab Anti-corrosion device at piston cylinder unit
DE10202529A1 (en) * 2002-01-24 2003-08-07 Suspa Holding Gmbh Piston-cylinder unit and process for its manufacture

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7920645U1 (en) * 1979-07-19 1979-10-25 Stabilus Gmbh, 5400 Koblenz Release device for the blocking valve of a gas spring

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7705770U1 (en) * 1977-02-25 1977-06-30 Boge Gmbh, 5208 Eitorf Sealing ring for sealing a piston rod of telescopic vibration dampers, in particular for motor vehicles
JPS5846277Y2 (en) * 1977-06-17 1983-10-21 トキコ株式会社 hydraulic shock absorber
EP0032988B1 (en) * 1980-01-25 1984-07-11 Boge GmbH Sealing arrangement, particularly for the sealing of a piston rod of telescopic oscillation dampers
DE3300771C1 (en) * 1983-01-12 1984-02-09 Boge Gmbh, 5208 Eitorf Gas-pressure damper of two-tube, telescopic construction

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7920645U1 (en) * 1979-07-19 1979-10-25 Stabilus Gmbh, 5400 Koblenz Release device for the blocking valve of a gas spring

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1672243A1 (en) 2004-12-15 2006-06-21 Stabilus GmbH Piston-cylinder unit and method for its manufacture

Also Published As

Publication number Publication date
EP0364851A1 (en) 1990-04-25
ES2045331T3 (en) 1994-01-16
DE58905317D1 (en) 1993-09-23
DE3834432A1 (en) 1990-04-12

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